LATIN DICTIONARYLexicon Latīnum
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“excellence, excellency” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

excellence, excellency
excellentia: praestantia. (The words are found in this connection and order.) excellentia praestantiaque: excellentia magnitudoque (both Cic.): Sometimes pulchritudo (beauty; e.g., virtutis, oratoris, mentis): excellentiae (in plur., Cic., Lael., 19, 69).
As a title, perhaps vir illustrissimus.
Par excellence (French = κατ’ ἐξοχήν), propter excellentiam (Cic., Top., 13, 55), or proprie (Cic., ib.); praecipue; prae ceteris; eximio nomine (e.g., aliquem or aliquid nominare). ☞ Sen. uses per excellentiam (Ep., 58), and Ulpian per eminentiam.

Quick answer

What is the Latin word for excellence, excellency?
The usual Latin words for “excellence, excellency” are excellō, praestō, pulchritūdō; also excellentia, virtūs, ōrātor. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.